Devices for the rolling of strip from metal powder



Sept. 22, 1959 I F. HECK 2,904,829

DEVICES FOR THE ROLLING OF STRIP FROM METAL POWDER Filed April 30, 1956I Heck fl-t Patented Sept. 22, 1959 I &Q

DEVICES FUR THE ROLLING 0F STRIP FROM METAL POWDER Friedrich Heck,Hamburg-Bergedorf, Germany Application April 30, 1956, Serial No.581,446

Claims priority, application Germany May 16, 1955 2 Claims. (Cl. 18-9)This invention relates to the design of a rolling mill for themanufacture of strip from metal powder. In devices of this nature theproblem arises of achieving a uniform compression of the metal powderover the entire width of the cross-section. It is in this caseparticularly difficult to roll a strip whose edges are uniformly denseand of a rectangular shape. In the devices which have been proposed ordisclosed in the past, there is frequently a reduction of the quantityof material along the edges, which produces notches at right angles tothe direction of rolling, when the rolling of the sintered strip iscontinued. In such cases it is necessary to trim the edges of themanufactured strip, so that considerable losses occur.

According to the present invention, discs projecting beyond the edge ofthe roll are provided for the lateral limitation of the width of thematerial, where the discs are movable in the direction of the axis ofthe rolls, and can be pushed by means of pressure rollers or slidingshoes against the roll edge, in the neighbourhood of the gap between therolls. The discs can be supported here on pins arranged laterally on theside of the roll body. It is in this case convenient to provide forslight play between these pins and the openings in the disc, so that thedisc can follow easily the lateral pressure exerted against it. Asupport of this nature can also be achieved by making the discs engagewith projections in grooves accommodated in the axial direction on theroll shafts.

In a preferred embodiment of the invention, the discs are made elastic.Also, at the back of the gap between the rolls pressure rollers areprovided, which slightly lift the edge of the discs from the roll body.This ensures that the strip can be lifted without friction off the roll.

The strip edges, which are sensitive while the strip is in the rawstate, are therefore protected.

The invention enables also the roll body faces to be reground withoutdilficulty, which is not the case if fixed edge discs are employed, whengrinding has an unfavourable elfect on the play in the length of theroll body.

The drawing shows an example of an embodiment of the invention:

Figure l is a diagrammatic side view of the device;

Figure 2 is the front view; and

Figure 3 is the plan view.

A powder hopper is accommodated above the gap between the rolls, wherethe powder hopper can be given any desired shape and does not form anobject of the invention. The two rolls 2 and 3 are arranged underneaththe said powder hopper. The width of the gap between the rolls can beseen in Figure 3. On both sides of the roll 2, Figure 2, discs 4 areaccommodated whose task is to limit the roll gap laterally, as shown inFigure 3. These discs 4 are supported on three pins 9 in such a way thatthey can move in the direction of the roll axis. Also, pressure rollers6 in rolling contact with the discs 4 are arranged so that they exert apressure against these discs 4 in the direction of the roll body. Therolls 2 and 3 are supported in the usual way by roll shafts 5. Pressurerollers 8 are provided at the back of the roll gap, which slightly liftthe edge of the elastic disc 4 off the roll body, so that the strip 7can be lifted oif the roll without friction.

What is claimed is:

1. A rolling mill for producing metal strip from metal powder,comprising: at least two rolls, means for rotating the rolls, means forfeeding metal powder to a gap between the rolls, two axially movablediscs carried by one of the rolls, one disc being at each end of theroll, the radius of each disc exceeding the radius of the roll thatcarries it by an amount at least equal to the width of the roll gap,pressure rollers for pressing the discs against the ends of thedisc-carrying roll in the neighbourhood of the roll gap, and pinsextending from the ends of the disc-carrying roll parallel to the rollaxis, the discs being freely slidable on these pins.

2. A rolling mill for producing metal strip from metal powder,comprising: at least two rolls, means for rotating the rolls, means forfeeding metal powder to a gap between the rolls, two axially movablediscs of elastic material carried by one of the rolls, one disc being ateach end of the roll, the radius of each disc exceeding the radius ofthe roll that carries it by an amount at least equal to the width of theroll gap, means for pressing the discs against the ends of thedisc-carrying roll in the neighbourhood of the roll gap, and rollersadapted to lift the edges of the discs away from the adjacent ends ofthe roll at a position beyond the roll gap.

References Cited in the file of this patent UNITED STATES PATENTS870,249 Patterson Nov. 5, 1907 1,185,399 Hayes Nov. 30, 1916 1,289,275Sargent Dec. 31, 1918 1,361,970 Dickey Dec. 14, 1920 2,341,732 MarvinFeb. 15, 1944 2,349,829 Nydegger et al. May 30, 1944 2,397,608 JohnsonApr. 2, 1946 2,811,750 Cofek Nov. 5, 1957 2,817,875 Harris et al. Dec.31, 1957

